Laboratory investigation of stone mastic asphalt using reclaimed asphalt pavement

Abstract

One of the current priorities in the pavement industries includes utilization of Reclaimed Asphalt Pavement (RAP) in the Stone Mastic Asphalt (SMA). There are numerous advantages to using reclaimed asphalt pavement, including reduced use of fresh bitumen and natural aggregates, lower costs, and lower emissions into the environment. SMA is well known in improving durability and resistance to cracks and to make use of both the RAP and SMA benefits, RAP can be incorporated in the SMA mixture. In the present work, maximum utilization of RAP is considered in the SMA. To soften the aged binder, Waste Engine Oil (WEO) is utilised as a rejuvenator. The 4% dosage by weight of binder is used in the mixture. The tests were performed to determine volumetric properties, Marshall stability, draindown, Cantabro abrasion test, Tensile Strength ratio (TSR) test. The results show that incorporation of RAP in SMA mixture increases the stability by 0.49% compared to that of conventional SMA mixture. It also indicated positive effect in the moisture susceptibility around 5%. The draindown of SMA contained with RAP mixture gives 0.17% value when compared to the conventional SMA mixture which shows 0.23% draindown. Hence results concluded that it is possible to use the 62% of RAP in the SMA mixture.